question about number plates vs body #'s

Why do we use number plates rather than tyvec body numbers? They cost more and don't seem any easier to pick, especially if hip and shoulder numbers are used. I was just wondering if there was a good reason or just carryover from moto x days.

Why do we use number plates rather than tyvec body numbers? They cost more and don't seem any easier to pick, especially if hip and shoulder numbers are used. I was just wondering if there was a good reason or just carryover from moto x days.

Perhaps because unlike 'cross for example (one of your other disciplines), MTB events following UCI rules require that you start and finish on the same bike? You can get mechancial assistance in tech zones now, including swapping parts, but you can't swap bikes altogether. The number plates possibly provide assistance in controlling this. Just a thought.

Also its easier to see the numbers when they are in the front of the bike ... both from scoring and also when you're checking out photos later on. You can actually see who's who if you're checking post-race results and photos.